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Important Linux features 219

DONE

INDEX

• PAT H = $ PA T H : / h o m e / g u e s t

• NMR=/opt/topspin/data/guest/nmr

• export PATH NMR

• 1r() { find $@ -name 1r -ls }

• alias ts=topspin

Now open a new shell:

• umask will be set to 002

• guests home directory is part of the Linux search path

• you can type cd $NMR instead of

cd /opt/topspin/data/guest/nmr

• you can type 1r <dirA> <dirB> for searching all files called 1r in the

in the directory trees dirA and dirB

• you can type ts instead of topspin

Note the difference between NMR, an environment variable and xw, a Linux func-

tion.

For csh and tcsh the file .cshrc is used. Note that the setting of environment var-

iables is handled differently.

13.2.5 umask

umask: set the initial permissions for file creation

The initial permissions of a file are set according to:

permission = creation permission - umask

• the creation permissions are:

666 for files created by an editor (e.g. vi, emacs)

777 for an executable program, created by a compiler

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Red Hat ENTERPRISE LINUX WS 2.1 - Guida di Installazione Pagina 219